#include <stdio.h>

int num;
char c;

int main(void)
{
    printf("c:%c\n",c);
    printf("num:%d\n",num);
    {
        int num=88;
    //此处访问的是局部变量
        printf("num:%d\n",num);
    }
    printf("num:%d\n",num);
    return 0;
}